The maxamps 4400 saddle works fine with the MM7700 in my XX4. It doesn't heat up anyway.... and runs fast. :)

I have a few maxx amps pack with no issues.

Yeah, but what about the difference in power between them and FP?
You know how difficult it is to try a very powerful lipo like the Evo20 and then switch to the ones made by MaxAmps, which I've heared that they are quite strong, but not as strong as the FP.
I also dont think that I can use them with my V-Balancer due to the balancing connector used in the MaxAmps.
I really dont have anything against them, but I always take quality and durability in concideration befor I buy any RC stuff.
I still need to dig in more to make sure that I will not regret it in the future.

If you do go with 4s, be sure to get more belts and CVD shafts

Sorry, Crazyjr, I did not understand your point?!!

Me too, 4 in total, never an issue with them. They stay in balance really good too.

much power ---------> broken belts, cvd`s...

i think that`s what he mean

Oh, sorry! I thought he was talking about the B4. He was referring to the 501x, then.
Thanks, Nieles.

Yeah sorry, I meant that at 4s you are going to break stuff, especially drivetrain parts. I have seen some TC3'sthat on high voltage have shattered titanium CVD shafts, buggy shafts are longer and no thicker